package cn.wolfcode.service.impl;

import cn.wolfcode.domain.Permission;
import cn.wolfcode.mapper.PermissionMapper;
import cn.wolfcode.qo.QueryObject;
import cn.wolfcode.service.IPermissionService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;

@Service
@Transactional
public class PermissionServiceImpl implements IPermissionService {

    @Autowired
    private PermissionMapper permissionMapper;

    @Override
    public void delete(Long id) {

        permissionMapper.deleteByPrimaryKey(id);

    }

    @Override
    public void save(Permission permission) {

        permissionMapper.insert(permission);
    }

    @Override
    public Permission get(Long id) {


        return permissionMapper.selectByPrimaryKey(id);
    }

    @Override
    public List<Permission> listALL() {

        return permissionMapper.selectAll();
    }

    @Override
    public void update(Permission permission) {

        permissionMapper.updateByPrimaryKey(permission);
    }

    @Override
    public void update(Permission permission, Long[] ids) {

        permissionMapper.updateByPrimaryKey(permission);


        /*//关联关系
        for (Long id : ids) {
            permissionMapper.insertRelation(permission, id);
        }*/
    }

    @Override
    public void save(Permission permission, Long[] ids) {

    }

    @Autowired
    private ApplicationContext ctx;  //spring 上下文


    @Override
    public void reload() {

        //把每个控制器的贴了注解的方法转发为权限数据,并插入到数据库
        //查询数据库中已经有的权限表达式
        List<String> permissions = permissionMapper.selectAllExpression();

        //获取所有的控制器

        Map<String, Object> map = ctx.getBeansWithAnnotation(Controller.class);
        Collection<Object> controllers = map.values();

        //遍历获取每个控制器中的方法
        for (Object controller : controllers) {

            //如果controller是普通的controller类,它的父类就是Object,Object的方法也没有贴注解,效果不影响,就是效率不高
            //判断是否cglib代理,如果不是就跳过
            if (!AopUtils.isCglibProxy(controller)){
                continue;
            }
            Class<?> clazz = controller.getClass().getSuperclass();  //控制器的字节码对象(controller是代理对象,获取他的父类)

            //遍历获取到每个方法
            Method[] methods = clazz.getDeclaredMethods();

            for (Method method : methods) {

                //判断该方法是否贴有自定义的注解
                //代理对象中的方法上的注释不能被继承,所以获取不到注解
                RequiresPermissions annotation = method.getAnnotation(RequiresPermissions.class);
                if (annotation != null){

                    //从注解中获取权限相关的数据,并封装为权限对象
                    //方式一:从注解中获取权限表达式
                    String name = annotation.value()[1];
                    String expression = annotation.value()[0];
                    //权限集合中不包括这个权限表达式,就需要插入
                    if (!permissions.contains(expression)){

                        Permission permission = new Permission();
                        permission.setName(name);
                        permission.setExpression(expression);

                        permissionMapper.insert(permission);
                    }
                }
            }
        }





    }

    @Override
    public List<String> selectExpressionByEmpId(Long id) {
        return permissionMapper.selectExpressionByEmpId(id);
    }


    @Override
    public PageInfo<Permission> query(QueryObject qo) {

       /* int count = permissionMapper.selectForCount(qo);
        if (count == 0){

            return new PageResult<>(qo.getCurrentPage(),qo.getPageSize() , Collections.emptyList(), count);

        }

        //获取总页数
        int totalPage = count % qo.getPageSize() == 0
                ? count / qo.getPageSize() : count / qo.getPageSize() + 1;
        //判断当前页是否大于总页数,如果是,把总页数作为当前页来查询分页结果集

        if (qo.getCurrentPage() > totalPage){

            qo.setCurrentPage(totalPage);
        }*/

        PageHelper.startPage(qo.getCurrentPage(),qo.getPageSize());
        List<Permission> permissions = permissionMapper.selectForList(qo);

        return new PageInfo<>(permissions);

    }


}
